4-QAMFour-Phase Quadrature Amplitude Modulation
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The symbol here represents 4-QAM modulated data and has 2 bits.
Quadrature Amplitude Modulation (QAM): This modulation method for cable broadcast reception is classified into technologies ranging from 4-QAM to 256-QAM, depending on the volume of data being transmitted.
It features 4-QAM (quadrature amplitude modulation) for spectrum efficiency and conforms to all relevant FCC standards.